package net.lzzy;

public class GenericStack<E> {
    private java.util.ArrayList<E> list = new java.util.ArrayList<>();

    public int getSize() {return list.size();}

    public E peek() {return list.get(getSize() - 1); }

    public void push(E o) {
        list.add(o);
    }
    public E pop(){
        E o = list.get(getSize() - 1);
        list.remove(getSize() - 1);
        return o;
    }

    public boolean isEmpty(){return list.isEmpty();}

    @Override
    public String toString(){return "stack:" + list.toString();}
}
